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<h2 class="bk_h2 bk_h2_news">News</h2>
<p>CStruct 1.0.0 has released!</p>
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<h2 class ="bk_h2 bk_h2_synopsish">Synopsis</h2>
<p>
CStruct is a simulation of the C language's struct.Its main purpose is to manipulate binary-data conveniently. It can be used in:<br />
1. Binary file IO like C.<br />
2. The parameter of the OS's API.(e.g. Win32)<br />
3. Other... <br />
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<h2 class ="bk_h2 bk_h2_start">Getting Started</h2>
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<h3>Install CStruct</h3>
<p>
Install CStruct is easy.
<div class="CodeRay">
<div class="code">gem install cstruct<br/></div>
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<h3>Using CStruct</h3>
<p>
Let's see an example,struct <b>Point</b> in C language(32-bit platform) like this:
<div class="CodeRay">
<div class="code"><span class="r">struct</span> Point<br/>
{<br/>
<span class="pt"> int</span> x;<br/>
<span class="pt"> int</span> y;<br/>
};
</div>
</div>
How to represent struct <b>Point</b> in Ruby? You can use CStruct to do it.
<div class="CodeRay">
<div class="code"><span class="r">class</span> <span class="cl">Point</span> < <span class="co">CStruct</span><br/>
int32<span class="sy">:x</span><br/>
int32<span class="sy">:y</span><br/>
<span class="r">end</span>
</div>
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Example:
<div class="CodeRay">
<div class="code">require <span class="s"><span class="dl">'</span><span class="k">cstruct</span><span class="dl">'</span></span><br/>
<span class="c"># struct Point in Ruby: </span><br/>
<span class="r">class</span> <span class="cl">Point</span> < <span class="co">CStruct</span><br/>
int32<span class="sy">:x</span><br/>
int32<span class="sy">:y</span> <br/>
<span class="r">end</span><br/>
<br/>
<span class="c"># create a Point's instance</span><br/>
point = <span class="co">Point</span>.new<br/>
<br/>
<span class="c"># assign like as C language</span><br/>
point.x = <span class="i">10</span><br/>
point.y = <span class="i">20</span><br/>
puts <span class="s">"point.x = #{point.x},point.y = #{point.y}"</span><br/>
<br/>
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<h3>Using Win32Struct</h3>
<p>
like this:
<div class="CodeRay">
<div class="code"><span class="r">typedef</span> <span class="r">struct</span> _OSVERSIONINFOEXA { <br/>
DWORD dwOSVersionInfoSize;<br/>
DWORD dwMajorVersion;<br/>
DWORD dwMinorVersion;<br/>
DWORD dwBuildNumber;<br/>
DWORD dwPlatformId;<br/>
CHAR szCSDVersion[ <span class="i">128</span> ];<br/>
WORD wServicePackMajor;<br/>
WORD wReserved[<span class="i">2</span>];<br/>
} OSVERSIONINFOEXA;<br/>
</div>
</div>
in ruby:
<div class="CodeRay">
<div class="code"><span class="r">class</span> <span class="cl">OSVERSIONINFOEXA</span> < <span class="co">Win32Struct</span><br/>
<span class="co">DWORD</span> <span class="sy">:dwOSVersionInfoSize</span><br/>
<span class="co">DWORD</span> <span class="sy">:dwMajorVersion</span><br/>
<span class="co">DWORD</span> <span class="sy">:dwMinorVersion</span><br/>
<span class="co">DWORD</span> <span class="sy">:dwBuildNumber</span><br/>
<span class="co">DWORD</span> <span class="sy">:dwPlatformId</span><br/>
<span class="co">CHAR</span> <span class="sy">:szCSDVersion</span>,[ <span class="i">128</span> ]<br/>
<span class="co">WORD</span> <span class="sy">:wServicePackMajor</span><br/>
<span class="co">WORD</span> <span class="sy">:wServicePackMinor</span><br/>
<span class="co">WORD</span> <span class="sy">:wReserved</span>,[<span class="i">2</span>]<br/>
<span class="r">end</span><br/>
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<h2 class ="bk_h2 bk_h2_learnmore">Lean More</h2>
Please see also <a href="documents.html">Documents</a> and <a href="examples.html">Examples</a>.
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